First of all, I already searched..... I ordered my JDM Header from R&D Monday and expect it to be here by Monday and it came with the header and cat. I know that I'm going to need a 2.5'' gasket to connect the header to the cat and I can use my original gasket to connect the other end of the cat to the stock exhaust. Now I know I need a few bolts which I have the exact sizes for, but other than the bolts what else do I need? I'd rather not pay the inflated Honda/Acura prices and I'm planning on going to a local auto store to buy the gasket/donut/flange that I'm going to need there. So someone please tell me what to buy and part numbers if you have them. Lastly, what kind of gasket, 2.5'' should I get? Are the cork style ok, or is a softer metal such as copper much better?

Thanks!

 

For me to connect my jdm header all I bought was a 2.5" cat, donut and flange to match it up. I just went to a local muffler shop and paid 25 bucks for both.